CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
9.8	$0-$5k	0.00

Summaryinfo

A vulnerability marked as critical has been reported in Alguest 1.0. Affected by this issue is some unknown functionality of the file admin.php of the component Authentication. This manipulation causes privileges management. This vulnerability is tracked as CVE-2002-0491. No exploit exists.

Detailsinfo

A vulnerability was found in Alguest 1.0. It has been declared as very critical. Affected by this vulnerability is an unknown code of the file admin.php of the component Authentication. The manipulation with an unknown input leads to a privileges management vulnerability. The CWE definition for the vulnerability is CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

admin.php in AlGuest 1.0 guestbook checks for the existence of the admin cookie to authenticate the AlGuest administrator, which allows remote attackers to bypass the authentication and gain privileges by setting the admin cookie to an arbitrary value.

The bug was discovered 03/24/2002. The weakness was disclosed 08/12/2002 (Website). It is possible to read the advisory at securityfocus.com. This vulnerability is known as CVE-2002-0491. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/16/2025). The attack technique deployed by this issue is T1068 according to MITRE ATT&CK.

The vulnerability was handled as a non-public zero-day exploit for at least 141 days. During that time the estimated underground price was around $0-$5k. By approaching the search of inurl:admin.php it is possible to find vulnerable targets with Google Hacking. The commercial vulnerability scanner Qualys is able to test this issue with plugin 10621 (Alguest Cookie Falsification Vulnerability).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at X-Force (8623), SecurityFocus (BID 4355†), OSVDB (10432†) and Vulnerability Center (SBV-6405†). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Name

• Alguest

Version

• 1.0

CPE 2.3info

• 🔍

CPE 2.2info

• 🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.8
VulDB Meta Temp Score: 9.8

VulDB Base Score: 9.8
VulDB Temp Score: 9.8
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Privileges management
CWE: CWE-269 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined
Google Hack: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

03/24/2002 🔍
03/24/2002 +0 days 🔍
03/24/2002 +0 days 🔍
08/12/2002 +141 days 🔍
08/12/2002 +0 days 🔍
12/12/2004 +853 days 🔍
07/22/2014 +3509 days 🔍
09/16/2025 +4074 days 🔍

Sourcesinfo

Advisory: securityfocus.com⛔
Status: Not defined

CVE: CVE-2002-0491 (🔍)
GCVE (CVE): GCVE-0-2002-0491
GCVE (VulDB): GCVE-100-18547
X-Force: 8623
SecurityFocus: 4355 - Alguest Cookie Falsification Vulnerability
OSVDB: 10432 - Alguest PHP could allow administrative access to the guestbook
Vulnerability Center: 6405 - Alguest 1.0 Allows Bypassing Authentication via Admin Cookie, High

Entryinfo

Created: 07/22/2014 22:06
Updated: 09/16/2025 16:46
Changes: 07/22/2014 22:06 (56), 06/04/2019 00:06 (3), 09/16/2025 16:46 (18)
Complete: 🔍
Cache ID: 216:567:103

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